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Texas Instruments SN74AVC8T245DGVR
- Part No.:
- SN74AVC8T245DGVR
- Manufacturer:
- Texas Instruments
- Package:
- 24-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
SN74AVC8T245DGVR.pdf
- Description:
- IC TRANSLATION TXRX 3.6V 24TVSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
SN74AVC8T245 from Texas Instruments is an 8-bit dual-supply bus transceiver enabling bidirectional voltage-level translation between 1.2 V, 1.5 V, 1.8 V, 2.5 V, and 3.3 V domains. It features independent VCCA (1.2–3.6 V) and VCCB (1.2–3.6 V) rails, 3-state outputs controlled by DIR/OE, Ioff for partial power-down, and VCC isolation. It is used in mixed-voltage system interconnects such as processor-to-peripheral data buses.
For engineers reviewing the SN74AVC8T245 datasheet, SN74AVC8T245 pinout, SN74AVC8T245 application, or SN74AVC8T245 equivalent, key selection criteria include dual-rail supply flexibility, 320 Mbps max data rate at ≥1.8 V supplies, 4.6-V I/O tolerance, latch-up immunity (>100 mA), and TVSOP-24 package compatibility with space-constrained PCB layouts.
Technical Context
The SN74AVC8T245 implements asynchronous bidirectional data flow using a direction-control (DIR) input referenced to VCCA and an output-enable (OE) input also referenced to VCCA. Data transmission occurs either A→B (DIR = high) or B→A (DIR = low), with both ports entering high-impedance when OE = high.
Its dual-rail architecture decouples A-port logic (VCCA-referenced) from B-port logic (VCCB-referenced), enabling true voltage translation without level-shifter external components. The VCC isolation feature forces all I/Os into high-impedance if either VCCA or VCCB is at GND, preventing backdrive during power sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Range (VCCA/VCCB) | 1.2 V to 3.6 V per rail - supports interoperability across 1.2V/1.5V/1.8V/2.5V/3.3V logic domains without external translators. |
| Max Data Rate | 320 Mbps when both VCCA ≥ 1.8 V and VCCB ≥ 1.8 V - enables high-speed interconnect in DDR memory interfaces and FPGA I/O expansion. |
| I/O Voltage Tolerance | 4.6 V - allows safe interfacing with higher-voltage legacy peripherals while powered from low-voltage rails. |
| Propagation Delay (tPLH/tPHL) | As low as 2.3 ns (A→B, VCCA = 3.3 V, VCCB = 3.3 V) - ensures timing-critical signal integrity in sub-ns synchronous systems. |
| ESD Protection | ±8000 V HBM - meets industrial-grade robustness requirements for handling and board assembly in non-EPA environments. |
| Operating Temperature | –40°C to +125°C - qualified for automotive under-hood and industrial control applications requiring extended thermal range. |
| Ioff Leakage Current | ±5 µA max - prevents damaging current backflow during partial power-down, supporting hot-swap and dynamic rail sequencing. |
Pinout & Package
SN74AVC8T245DGVR uses a 24-pin TVSOP (Thin Very Small Outline Package) with 0.4 mm pitch, measuring 5.0 mm × 6.4 mm. This RoHS-compliant, surface-mount package supports automated assembly and offers thermal resistance RθJA = 116.7°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCCA (Pin 1) | A-port supply | Powers A-side I/Os and control inputs (DIR, OE); sets VIH/VIL thresholds for DIR/OE. |
| DIR (Pin 2) | Direction control | High = A→B data flow; low = B→A; referenced to VCCA for consistent logic threshold across supply voltages. |
| A1–A8 (Pins 3–10) | A-port I/Os | Bidirectional data lines referenced to VCCA; tolerate up to 4.6 V regardless of VCCA setting. |
| GND (Pins 11, 12, 13) | Ground reference | Common return path for both power domains; three pins reduce ground bounce in high-speed switching. |
| OE (Pin 22) | Output enable | High = all A/B outputs in high-impedance; referenced to VCCA; pull-up to VCCA ensures safe power-up state. |
| B1–B8 (Pins 14–21) | B-port I/Os | Bidirectional data lines referenced to VCCB; tolerate up to 4.6 V regardless of VCCB setting. |
| VCCB (Pins 23, 24) | B-port supply | Powers B-side I/Os; dual VCCB pins improve current delivery and reduce IR drop in high-drive scenarios. |
Key Features
| Feature | Design Value |
|---|---|
| Dual-rail voltage translation | Independent 1.2–3.6 V operation on VCCA and VCCB enables seamless interface between heterogeneous logic families (e.g., 1.8-V FPGA ↔ 3.3-V sensor hub). |
| VCC isolation | Automatic high-impedance on all I/Os if either VCCA or VCCB = GND - eliminates need for external power-good sequencing logic. |
| Ioff partial power-down | Sub-µA leakage (< ±5 µA) when unpowered - prevents back-current damage during rail ramp-down in multi-supply systems. |
| 4.6-V tolerant I/Os | Safe operation with 5-V-tolerant signals while powered from 1.2 V - avoids clamping diodes or external resistors in mixed-voltage designs. |
| 320 Mbps data rate | Validated performance at ≥1.8 V supplies - supports high-throughput protocols like SPI, I²C fast-mode+, and parallel address/data buses. |
Applications
| Processor-to-Peripheral Interconnect | FPGA I/O Expansion |
|---|---|
Use Scenario: Connecting a 1.8-V ARM Cortex-M7 microcontroller to a 3.3-V UART transceiver and 2.5-V ADC in an industrial PLC module. IC Role / Device Role / Timing Role: Bidirectional level translator managing data flow direction via DIR and isolating buses via OE during firmware updates. Use Value: Eliminates discrete MOSFET-based translators, reduces BOM count by 6+ components, and guarantees <2.5 ns propagation delay across voltage domains. |
Use Scenario: Expanding I/O count of a Xilinx Artix-7 FPGA operating at 1.8 V to drive multiple 3.3-V GPIO peripherals in a test equipment controller. IC Role / Device Role / Timing Role: Configurable bus transceiver providing scalable, pin-compatible I/O extension with programmable direction control. Use Value: Enables single-FPGA design reuse across 1.2-V, 1.8-V, and 3.3-V peripheral variants without PCB respin or layout changes. |
| DDR Memory Interface Buffer | Hot-Swappable Module Interface |
Use Scenario: Isolating and translating command/address/control signals between a 2.5-V DDR3 memory controller and 1.5-V DDR3L SDRAM in a telecom baseband card. IC Role / Device Role / Timing Role: Low-skew, high-speed bus buffer with precise OE-controlled 3-state timing to meet DDR setup/hold windows. Use Value: Achieves 320 Mbps throughput with <3 ns tPLH/tPHL variation across temperature, meeting JEDEC DDR3 timing margins. |
Use Scenario: Enabling hot-plug insertion of a 3.3-V PCIe add-in card into a 1.2-V host motherboard slot with sequenced power rails. IC Role / Device Role / Timing Role: Ioff-enabled translator that enters high-Z before VCCB ramps, preventing backfeed into unpowered host logic. Use Value: Meets PCIe hot-plug specification for safe insertion/removal without system reset or data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bus transceiver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AVCH8T245DGVR | Includes bus-hold circuitry on all I/Os; otherwise identical pinout, supply range, and speed. | Eliminates need for external pull-up/down resistors on floating data lines; preferred in systems with intermittent bus activity. | Select SN74AVCH8T245DGVR when bus-hold functionality is required to maintain last valid logic state during tri-state intervals. |
| TXB0108RGTR | Auto-direction sensing (no DIR pin); lower drive strength (±4 mA vs ±12 mA); smaller 20-pin VQFN package. | Designed for I²C/SPI with automatic direction detection; not suitable for high-speed parallel buses requiring explicit DIR control. | Choose TXB0108RGTR only for low-speed, low-pin-count serial interfaces where DIR pin elimination simplifies routing. |
Compared with SN74AVC8T245DGVR, SN74AVCH8T245DGVR adds bus-hold for stable idle states but shares identical timing and voltage specs, while TXB0108RGTR trades DIR control and drive strength for auto-sensing convenience in serial-only use cases.
Availability
SN74AVC8T245DGVR is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, and embedded computing applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for SN74AVC8T245DGVR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and connectivity solutions, with decades of expertise in logic interface ICs and power management.
The SN74AVC8T245 belongs to TI's AVC (Advanced Very-low-voltage CMOS) logic family, engineered specifically for ultra-low-voltage bidirectional translation in space- and power-constrained portable and industrial systems.
FAQ
What voltage ranges can SN74AVC8T245DGVR support on its VCCA and VCCB rails?
SN74AVC8T245DGVR supports 1.2 V to 3.6 V independently on both VCCA and VCCB. This allows translation between any combination of 1.2-V, 1.5-V, 1.8-V, 2.5-V, and 3.3-V logic domains. Operation below 1.2 V is not guaranteed, and exceeding 3.6 V violates absolute maximum ratings.
How does the DIR pin function in SN74AVC8T245DGVR, and what is its voltage reference?
The DIR pin in SN74AVC8T245DGVR controls data direction: high enables A→B transmission, low enables B→A. Its logic thresholds (VIH/VIL) are referenced to VCCA, ensuring correct interpretation regardless of VCCB voltage. This eliminates ambiguity when VCCA and VCCB differ.
Does SN74AVC8T245DGVR support hot-plug or partial power-down operation?
Yes, SN74AVC8T245DGVR supports partial power-down via its Ioff feature: when either VCCA or VCCB is at 0 V, all I/Os enter high-impedance with leakage ≤ ±5 µA. This prevents back-current damage during rail sequencing or hot-swap events, making it suitable for modular systems.
What is the maximum data rate achievable with SN74AVC8T245DGVR, and under what conditions?
SN74AVC8T245DGVR achieves up to 320 Mbps when both VCCA ≥ 1.8 V and VCCB ≥ 1.8 V. At lower supplies (e.g., VCCA < 1.8 V or VCCB < 1.8 V), the maximum rate drops to 170 Mbps. These values are measured under specified load and temperature conditions per TI's SCES517K datasheet.
Is SN74AVC8T245DGVR pin-compatible with other members of the SN74AVC8T245 family?
Yes, SN74AVC8T245DGVR shares identical pinout and footprint with all SN74AVC8T245 variants (e.g., DGV, PW, RHL packages). The "DGVR" suffix denotes the tape-and-reel TVSOP-24 variant; electrical behavior and pin functions are fully consistent across package options.
SN74AVC8T245DGVR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AVC
- Package/Case:
- 24-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Logic Type:
- Translation Transceiver
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Input Type:
- -
- Output Type:
- 3-State
- Current - Output High, Low:
- 12mA, 12mA
- Voltage - Supply:
- 1.2V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-TVSOP
SN74AVC8T245DGVR FAQ
1.How can I place an order for SN74AVC8T245DGVR through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AVC8T245DGVR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SN74AVC8T245DGVR reliable?
The price and inventory of SN74AVC8T245DGVR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AVC8T245DGVR is usually 5 days.
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Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SN74AVC8T245DGVR?
For technical support, including SN74AVC8T245DGVR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AVC8T245DGVR requirements.
6.How does Aetrix verify that SN74AVC8T245DGVR is sourced from the original manufacturer or authorized distributors?
All SN74AVC8T245DGVR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SN74AVC8T245DGVR meets industry standards.
7.What is the process for return or replacement of SN74AVC8T245DGVR?
All SN74AVC8T245DGVR units undergo pre-shipment inspection (PSI). If there is an issue with SN74AVC8T245DGVR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SN74AVC8T245DGVR part is unused and in its original packaging.
Return procedure for SN74AVC8T245DGVR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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